The Spanish word 'comido' (eaten) comes from the verb 'comer' (to eat), which traces back to the Latin verb 'comedere' meaning 'to eat up' or 'devour'. The Latin 'comedere' itself was formed by combining two elements: the prefix 'com-' meaning 'with, together' and the verb 'edere' meaning 'to eat'. The intensifying prefix 'com-' added the sense of completeness to the action of eating, hence 'to eat up' rather than just 'to eat'.

The past participle 'comido' developed from 'comer' following regular Spanish verb patterns, where -er verbs form their past participles with -ido.

Several common Spanish words share this root with 'comido'. The most basic is the infinitive 'comer' (to eat), which you'll encounter very frequently. There's also 'comida' (food, meal), 'comedor' (dining room), and 'comestible' (edible). All these words share the basic meaning related to eating.

While English 'eat' is not related to Spanish 'comido', we can find some English cognates through Latin. The word 'comestible' exists in English too, meaning 'edible', though it's rather formal. The prefix 'com-' is very common in English words like 'combine', 'compress', and 'complete', always carrying the sense of 'together' or 'thoroughly'.